How to use c++ class objects from .mm file in other file? - c++

Question

I have made two files that are MathUtils.h
#include "iostream"
and MathUtils.cpp
#include "MathUtils.h"
using namespace std;
//Box class .....................
class Box
{
private:
double length; // Length of a box
double breadth; // Breadth of a box
double height; // Height of a box
public:
void setParameters(int l,int b,int h);
int volume();
int area();
};
void Box::setParameters(int l, int b, int h)
{
length=l;
breadth=b;
height=h;
}
int Box::volume()
{
return length*breadth*height;
}
int Box::area()
{
return (2*(length*breadth) + 2*(breadth*height) + 2*(height*length));
}
//sphere class................
class Sphere
{
private:
double pi=3.14;
double r;
public:
void setParameters(int radius);
int volume();
int area();
};
void Sphere::setParameters(int radius)
{
r=radius;
}
int Sphere::volume()
{
return (4/3)*pi*r*r;
}
int Sphere::area()
{
return 4*pi*r*r;
}
How can we use this file in my project could any one help me.I have never use c++ files in my project so I want to know how can we use Box and Sphere class object in other viewController file.
Thanks!.

Answer 1

You define your classes in the .h file.
For your example, move:
class Box
{
private:
double length; // Length of a box
double breadth; // Breadth of a box
double height; // Height of a box
public:
void setParameters(int l,int b,int h);
int volume();
int area();
};
class Sphere
{
private:
double pi=3.14;
double r;
public:
void setParameters(int radius);
int volume();
int area();
};
to mathutils.h and add #include "mathutils.h" to your viewController file. Your member functions for Box should still be in mathutils.c
A function in your view controller can then make use of it:
{
Box b;
b.setParameters(1,2,3);
int v = b.volume();
int a = b.area();
}